package com.heima.wemedia.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.exception.CustomException;
import com.heima.file.service.FileStorageService;
import com.heima.model.common.dtos.PageRequestDto;
import com.heima.model.common.dtos.PageResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.wemedia.dtos.WmMaterialDto;
import com.heima.model.wemedia.pojos.WmMaterial;
import com.heima.utils.thread.WmThreadLocalUtil;
import com.heima.wemedia.mapper.WmMaterialMapper;
import com.heima.wemedia.service.WmMaterialService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.multipart.MultipartFile;

import java.util.Date;
import java.util.Objects;
import java.util.UUID;

/**
 * @author brianxia
 * @version 1.0
 * @date 2022-10-21 10:19
 */
@Service
@Slf4j
public class WmMaterialServicleImpl extends ServiceImpl<WmMaterialMapper, WmMaterial>
        implements WmMaterialService {

    @Autowired
    private FileStorageService fileStorageService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public WmMaterial uploadFile(MultipartFile file) {
        //判断是否登录
        if(WmThreadLocalUtil.getUser() == null){
            throw new CustomException(AppHttpCodeEnum.NEED_LOGIN);
        }
        //0.准备文件名
        String originalFilename = file.getOriginalFilename();//获取原始文件名 a.jpg
        int i = originalFilename.lastIndexOf(".");
        String fileName = UUID.randomUUID().toString();
        if (i > -1) {
            String suffix = originalFilename.substring(i);
            fileName = fileName + suffix; //拼接后缀
        }
        //1.上传文件
        String path = null;
        try {
            path = fileStorageService
                    .uploadImgFile("", fileName, file.getInputStream());

            //2.保存到数据库
            WmMaterial wmMaterial = new WmMaterial();
            wmMaterial.setUrl(path);
            wmMaterial.setUserId(WmThreadLocalUtil.getUser().getId());
            wmMaterial.setCreatedTime(new Date());
            save(wmMaterial);
            return wmMaterial;

        } catch (Exception e) {
            log.error("上传文件和保存数据库错误", e);
            if(StringUtils.isNotBlank(path)){
                fileStorageService.delete(path);
            }
            throw new CustomException(AppHttpCodeEnum.SERVER_ERROR);
        }

    }

    @Override
    public PageResponseResult findPage(WmMaterialDto dto) {

        if(WmThreadLocalUtil.getUser() == null){
           throw new CustomException(AppHttpCodeEnum.NEED_LOGIN);
        }

        dto.checkParam();//对page size进行校验

        LambdaQueryWrapper<WmMaterial> wrapper = Wrappers.<WmMaterial>lambdaQuery()
                .eq(WmMaterial::getUserId,WmThreadLocalUtil.getUser().getId())
                .orderByDesc(WmMaterial::getCreatedTime)
                ;
        if(Objects.equals(dto.getIsCollection(), WmMaterialDto.COLLECTION)){
            //拼接上条件，筛选出收藏的图片
            wrapper.eq(WmMaterial::getIsCollection,WmMaterialDto.COLLECTION);
        }

        Page<WmMaterial> page = page(new Page<>(dto.getPage(), dto.getSize()), wrapper);
        PageResponseResult result = new PageResponseResult((int) page.getCurrent(),
                (int) page.getSize(), (int) page.getTotal());

        result.setData(page.getRecords());

        return result;
    }
}
